package com.example.utils.util.Imageurl;

import org.apache.commons.codec.binary.Base64;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * TODO
 *
 * @ClassName pngUtil
 * @Author xiaojiang
 * @Date 2021/11/25 下午 16:55
 */
public class pngUtil {



    public static String image2Base64(String imgUrl) {
        URL url = null;
        InputStream is = null;
        ByteArrayOutputStream outStream = null;
        HttpURLConnection httpUrl = null;
        try{
            url = new URL(imgUrl);
            httpUrl = (HttpURLConnection) url.openConnection();
            httpUrl.connect();
            //httpUrl.getInputStream();
            is = httpUrl.getInputStream();
            outStream = new ByteArrayOutputStream();
            //创建一个Buffer字符串
            byte[] buffer = new byte[1024];
            //每次读取的字符串长度，如果为-1，代表全部读取完毕
            int len = 0;
            //使用一个输入流从buffer里把数据读取出来
            while( (len=is.read(buffer)) != -1 ){
                //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
                outStream.write(buffer, 0, len);
            }
            // 对字节数组Base64编码
            return pngUtil.encodeImage(outStream.toByteArray());
        }catch (Exception e) {
            e.printStackTrace();
        }
        finally{
            if(is != null)
            {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(outStream != null)
            {
                try {
                    outStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(httpUrl != null)
            {
                httpUrl.disconnect();
            }
        }
        return imgUrl;
    }
    /**
     * 图片转字符串
     * @param image
     * @return
     */
    public static String encodeImage(byte[] image){
        //BASE64Encoder decoder = new BASE64Encoder();
        return replaceEnter(Base64.encodeBase64String(image));
    }

    public static String replaceEnter(String str){
        String reg ="[\n-\r]";
        Pattern p = Pattern.compile(reg);
        Matcher m = p.matcher(str);
        return m.replaceAll("");
    }


    /**
     *  TODO   通过base64转换为image并保存到指定的路径，下面为Base64Util的代码
     * @Author 江
     * @Date 2021/11/25 下午 16:56
     */
    public static void base64ToImage(String path,String base64) {
        File file = null;
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        try {
            byte[] bytes = Base64.decodeBase64(base64);
            file = new File(path);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }


    }

    public static void main(String[] args) {
        String path = "C:\\Users\\xiaojiang\\Desktop\\rfc4825\\tran-1.jpeg";
        String urlPath = "https://doctrans-service.youdao.com/trandoc/doc/getFullOriginModeImg?docKey=7DD4FF76D43C45588B564151C1BD7FA4&pageName=tran-1.jpeg&src=fanyiweb&isCheckTermUpdate=false&isUseTerm=true";

        String s = pngUtil.image2Base64(urlPath);
        System.out.println(s);
        pngUtil.base64ToImage(path,s);


    }






}
